OpenSearch/rest-api-spec/api/indices.exists_alias.json

{
  "indices.exists_alias": {
    "documentation": "http://www.elasticsearch.org/guide/reference/api/admin-indices-aliases/",
    "methods": ["HEAD"],
    "url": {
      "path": "/_alias/{name}",
      "paths": ["/_alias/{name}", "/{index}/_alias/{name}"],
      "parts": {
        "index": {
          "type" : "list",
          "description" : "A comma-separated list of index names to filter aliases"
        },
        "name": {
          "type" : "list",
          "required" : true,
          "description" : "A comma-separated list of alias names to return"
        }
      },
      "params": {
        "ignore_indices": {
          "type" : "enum",
          "options" : ["none","missing"],
          "default" : "none",
          "description" : "When performed on multiple indices, allows to ignore `missing` ones"
        }
      }
    },
    "body": null
  }
}